Discrete Random Variables — OCR A-Level Further Mathematics

Teaching note based on the OCR specification.

Test yourself on Discrete Random Variables with OCR A-Level practice questions.

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1 diagram and illustration

1 interactive diagram to visualise key concepts

Start: Given a DRV

➔Find k?

Find k?

➔"Yes"ΣP(X=x)=1

➔"No"Calculate E(X)

ΣP(X=x)=1

➔Calculate E(X)

Calculate E(X)

➔Calculate E(X²)

Calculate E(X²)

➔Calculate Var(X) = E(X²) - [E(X)]²

Calculate Var(X) = E(X²) - [E(X)]²

➔Linear Combination?

Linear Combination?

➔"Yes"Apply E(aX+b) & Var(aX+b)

➔"No"End

Apply E(aX+b) & Var(aX+b)

➔End

Flowchart for solving a typical single-variable DRV problem.